I'm using a class 4, 8GB for mine at the moment, and the speed seems to be fine. It plays some reasonably large (1500 bitrate) video files without a problem, which would probably be where the problem would occur if there was one.

I just picked up (3) 16GB class 4 micro-SDHC from Amazon, some strange off-brand, so we'll see how well they work. Right around 30 bucks per 16GB SDHC.

I'm using a class 4, 8GB for mine at the moment, and the speed seems to be fine. It plays some reasonably large (1500 bitrate) video files without a problem, which would probably be where the problem would occur if there was one.

I just picked up (3) 16GB class 4 micro-SDHC from Amazon, some strange off-brand, so we'll see how well they work. Right around 30 bucks per 16GB SDHC.

I got the Kingmax 16gb class 10 from Amazon ($50). It works very well with 10Mbps writing.

i've used microSD in my sony prs600 before and they work fine.
only thing you may find is the cheaper cards tend to be unreliable, plus there have been a rash of counterfeits with overstated capacity that corrupt data when you write more than the actual capacity (often 512MB for a 4GB) Caveat Emptor!

yeah, the slow cards seem to work fine.
I would mention that some seem to overheat if you copy lots of stuff to them (my experience with the 8GB kingston suggested this)
apparently its a known issue and has been fixed since then.

1) There are actually two types of Secure Digital (SD) cards: SD and SDHC. SD cards cary in size and go up as high as 1gb only, SDHC the HC stands for High Capacity starts at 2gb and goes on from there. To be able to use the SDHC your device must be able to read the HC format which is different from the SD format. I am pretty certain that all readers can handle HC, but its worth checking.

2) Class referrs to the speed of the card rather than the size of it. The higher the class number the faster the card is. You will find that the higher capacity cards, not only cost more but have lower classes, in other words are slower so you need to find a happy medium between size and speed.

For you I would recommend a 16gb SDHC. Half of the caqrd would go to your MP3s and still have half left over for your ebooks and you do not trade away much in terms of speed. Looks like the best deal for you is Mwave for $16 http://stores.nextag.com/store/47689...shot-sdhc-card

1) There are actually two types of Secure Digital (SD) cards: SD and SDHC. SD cards cary in size and go up as high as 1gb only, SDHC the HC stands for High Capacity starts at 2gb and goes on from there.

According to Newegg and others, the SD cards went up to 2gb. I have an older reader that is SD only, and 2gb SD cards are the upper limit of what I can read.